html,
body {
  width: 100%;
  height: 100%;
  font-size: 13.33vw;
}
.nav img {
  margin: 0.3rem auto;
  margin-top: 20%;
  background-color: red;
}

.nav p {
  height: 0.4rem;

  text-align: center;
  font-size: 0.14rem;
}
.yonghu {
  width: 1rem;
  height: 0.4rem;
  background-color: #ccc;
  padding: 0.04rem 0.04rem;
}
